x = "aello aython "
print(x.title())
print(x.lower())
print(x.upper())
#剔除函数
a=' python '
a=a.lstrip()
a=a.rstrip()
a=a.strip()
print(a)
#制表符\t 换行符 \n
print('\tpython2')
print('python3\njavascript')
# str()转为字符串
age=18
msg='永远'+str(age)+'岁'
print(msg)
